developing news out of san francisco tonight. hazmat crews have evacuated a block in the north beach area of san francisco on powell street. police responded to a call of an apparent suicide about three hours ago. emergency responders smelled chemicals when they got to the scene. 15 people inside the building have been evacuated. >>> that spectacular light show we've all been waiting for is expected to happen overnight tonight. earlier this evening, a crowd at the college at san mateo turned out for a previously scheduled astronomy festival. don? >> reporter: if there's one thing that's known about that spectacular fireball that cruised over the bay area this week, it's that it got everybody's attention. and some scientists suggest, for that reason alone, it may be good for science. adults and children peer through scopes on the rooftop of the science building at the college of san mateo. the science and astronomy festival was planned for one time. a fireball that rolled through the bay area. it slowed enough to increase chances